When a surgical count comes up short, operating room teams frequently rely on intraoperative radiographs to locate the missing item or confirm that nothing was left behind. However, a clear image is often treated as absolute proof of a clean surgical field—an assumption that can lead to dangerous oversights. A recent landmark study published in the British Journal of Radiology highlights why relying solely on negative X-rays poses a serious risk to patient safety.1
Low Sensitivity Means High Risk
The six-year study analyzed 145 surgical missed item events (SMIEs) to evaluate the diagnostic reliability of X-ray imaging. While X-rays demonstrated a 100% specificity—meaning a positive result accurately confirms a foreign body—their sensitivity was an alarmingly low 30%¹.
This means standard intraoperative X-rays miss 70% of retained surgical foreign bodies, creating a critical blind spot. A “blank” scan frequently yields a false negative, giving OR teams a false sense of security while a dangerous object remains hidden in tissue.
The Most Common Unseen Objects
Small or obscured items are particularly prone to being overlooked on standard radiographs:
- Suture Needles: Accounted for 43.08% of missed items, making them the most frequently lost surgical objects.
- Surgical Textiles: Represented 23.09% of cases, often blending into soft tissue.
Broken Instruments: Comprised 20% of incidents, frequently hiding deep within anatomical structures.
Key Quotes from the Study
- The sensitivity of X-rays in detecting SMIEs was 30%, meaning that X-rays identified less than one-third of RSIs.
- Nearly half of the cases involved needles or needle fragments, which are notoriously challenging to detect using X-rays. High-risk factors for needle retention include minimally invasive surgical techniques and smaller needle sizes.
- Needles measuring 17mm or longer were detectable by 84% of surgeons using X-rays, while only 13% could identify a 13-mm needle , highlighting that needles shorter than 17 mm pose a greater risk of being undetected in minimally invasive surgeries.
Rethinking Post-Discrepancy Protocols
The study’s authors emphasized that a negative X-ray should never be considered definitive proof that a patient is clear, especially when clinical suspicion remains high. Furthermore, failure to identify these items leads to severe postoperative complications—21.54% of patients in the study suffered adverse events, including hospital readmissions and emergency re-operations.
To protect patients and reduce unnecessary surgical re-interventions, surgical teams must adopt supplemental detection tools that go beyond the physical and diagnostic limitations of standard radiography.
How does your operating room currently manage protocol when a surgical count discrepancy occurs alongside a negative intraoperative X-ray?
References
- Assessing the diagnostic value of radiographs for retained surgical items: A cautionary analysis | British Journal of Radiology | Oxford academic. (n.d.). https://academic.oup.com/bjr/article-abstract/99/1177/150/8304053?redirectedFrom=fulltext
